Abstract
This study aimed to evaluate the effects of oat or ryegrass over seeding on the productive characteristics and morphological composition of Tifton85 grass under continuous grazing. The three studied treatments were: Oat + Tifton85, Ryegrass + Tifton85 and Tifton85, distributed in a completely randomized design, constituting four replications of area per treatment. The Ryegrass + Tifton85 treatment presented a forage mass 27% superior to the Oat + Tifton85 treatment. The leaf percentage of Tifton85 was superior for the treatment Oat + Tifton85 (41%), while the percentage of stem + sheath was superior in the treatment Ryegrass + Tifton85 (64%). There was a higher percentage of Tifton85 leaves in the treatment Oat + Tifton85, while the Ryegrass + Tifton85 treatment presented a higher proportion of the stem + sheath constituent. Overfeeding species of temperate climate has proven to be a viable alternative, since it potentiates the weight gain of animals without damaging the productive re-establishment of Tifton85.
Highlights
The current expansion of agricultural areas over those formerly occupied by livestock farming has been reshaping the productive landscape in the State of Rio Grande do Sul
Considering the above, the goal of this study was to evaluate the effects of oat or ryegrass over seeding on the productive characteristics and morphological composition of Tifton85 grass, as well as the performance of steers kept on these pastures
Four paddocks were seeded with black Oat (Avena strigosa Schreb), four paddocks were seeded with Ryegrass (Lolium multiflorum Lam.) and another four paddocks were kept as a control, being designated the three treatments: Oats + Tifton85, Ryegrass + Tifton85 and Tifton85
Summary
The current expansion of agricultural areas over those formerly occupied by livestock farming has been reshaping the productive landscape in the State of Rio Grande do Sul. The intensification of pastoral systems is one of the most striking transformations that began to use forage species that combine high growth rates with nutritional quality. Cynodon grasses spread through rhizomes and stolons; demonstrating considerable resistance to oscillations in soil type, pH and cold tolerance (Costa et al, 2014; Marchesan et al, 2013). Their productive characteristics have not yet been fully clarified, these characteristics have contributed to the expansion of cultivated area (Simöes et al, 2012). This species, like the native field, slows down or stops its growth in fall/winter, especially because of reduced temperature
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